On one of our servers we can see 3 traces running with NULL FileName, NULL MaxSize. When geting the data from sys.fn_trace_getinfo values are NULL for property 2,3&4. Value 1 is returned for properties 1 & 5.

Could anybody help to understand this or if anybody else has experienced the same situation earlier?

wierd;i cannot get a trace to be created with either the options or the filename to be null;it's wierd that you are able to see that.

i tried stuff like stopping my example traces, but that just changes the status; doesn't affect teh otehr parameter values.

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After digging in it looks like it is not a server side trace or a profiler trace. When checked from sys.dm_exec_sessions the host process is SQL Server Analysis Services & from sys.dm_exec_requests wait_type is TraceWrite.

I am still not sure what kind of trace it could be or if traces could be run by Analysis Services?